modflow laboratory
Circuit simulators like SPICE for low memory computers
GHDL - a VHDL simulator
Multiscale Neuroscience and Systems Biology Simulator
a very lightweight advanced terrain-rendering and 3D map rendering sys
Various TCP/IP servers, clients and network management tools
Otanes is a live TV simulator for Content-Centric Networking (CCN).
Continuous BACnet/IP LAN monitoring
Multithreaded N-Point Gravity Simulation for PC and Android
Simulador Educacional de Circuitos Digitales
A highly flexible 3D flocking boids simulator, conceived as a tool for
evolution for vegastrike SpaceSim/Combat/Trade game
A Java based, pMars compatible, CoreWars simulator with GA
Discrete event simulator for elastic optical links.
action/combat flight sim
A web-browser based viewer for opensim/OpenSimulator
The free and Open Source hockey simulator